Fibaro has been making smart home devices and HomeKit-compatible products for a few years now, and the company has several sensors that work with
Fibaro FGBHFS-101 Flood, Water & Temperature Sensor Homekit
Water leak detector - Flood Sensor
Review: Fibaro's HomeKit water sensor is a must as flood-season
Fibaro Flood Sensor Review - MacRumors
Fibaro Launches First Apple HomeKit-Enabled Water Leak and Flood
Fibaro Flood Sensor Review - MacRumors
HomeKit Product Review: Fibaro Flood Sensor
Fibaro Flood Sensor Review - MacRumors
Review: Fibaro Flood Sensor uses HomeKit automation to help detect
Fibaro Fgfs-101 Homekit Flood Sensor (FGBHFS-101)